Johnson City police interview riders that were on the bus when a woman was stabbed as she was entering the bus. The bus was at the intersection of Baxter Street and E. Watauga Ave. Ron Campbell/Johnson City Press

Johnson City police arrested a Massachusetts man suspected of trying to kill his pregnant girlfriend and the couple's unborn child as they started to board a city transit bus, according to a department press release.

Sanders L. Dixon, 22, 38 High St. Apt. 101, Springfield, Mass., was charged with two counts of attempted first-degree murder. According to police, Dixon stabbed the woman, still unidentified by police, in the back. In the release, police said the two had recently been involved in an argument.

The stabbing happened around 9:30 a.m. Monday at the corner of Watagua Avenue and Baxter Street. The bus had stopped at the corner and the woman was getting ready to board when Dixon came up behind her and stabbed her.